Dry shaver



31111623; 41936. J. sjcHlcK 2,0455106 DRY SHAVER Filed Sept. 20, 1935 j i l Patented June 23, 1936 UNITED STATES PATENT OFFICE par snnvna .mob schick. sembra, conn. Application september zo, 1935, serial No. 41,385 4 claims. (ci. ca -'43) This invention relates to an improved shaving machine, particularly machines that shave dry hair, and is designed to overcome certain disadvantages resident in former types of shaving heads.

The shaving head of a dry shaver comprises an outer shear member of rectangular or circular shape in cross-section and an inside cutter of rectangular or circular shape in cross-section movably placed inside the outer member. 'Ihe two members of the assembly are slotted to form narrow blades and the movement of one relative to the other causes the blades to sever hair in the slots. The proper functioning for securing a comfortable shave depends to a great extent on an even pressure to maintain the blades or teeth of the inside cutter against the inside face of the blades of the outer member in close contact for the entire length of the shaving head. 'I'he usual device heretofore employed has been springs mounted at or near the ends of the cutters. This is satisfactory to some extent but the dimculty is in securing springs that have and maintain an even pressure. One of the springs is weaker or ,becomes weakened with use and one end of the inside cutter is pressed either too lightly or too strongly against the outer member. This condition, if too strong, puts too much load on the motor of the machine, or if too light allows minute ends of hair to work in space between the blades of the members, holding them apart slightly and this in turn interferes with proper clipping and the machine pulls" when used for shaving.

The present invention is designed to provide a.

shaving head in which the. pressure is evenly applied and is balanced whereby the pressure of the inner member against the outer member is the same for its entire'length.

The invention is illustrated in the accompany.-

ing drawing. Figure 1 is a sectional view of a shaving head made according to my invention, the sectionized parts being taken on line I--I in Figure 2. Figure 2 is a central longitudinal section of the shaving head shown in Figure 1.. Figure 3 is a section taken on line 3-4 in Figure 2. Figure 4 is a'view similar to vFigure 2 but showing a modified form of cutter support. Figure 5 is a cross-section showing. the spring support applied to around shaver. v

The shaving head is' of the usual-commercial form such as .in the United States Patent No.

-1,747,031 granted to Jacob Schick'. The particular form of shaver isknt important, however, as the support is applicable to any shaver or clipper motor.-

narrow blades l2. The outer -member has the' block or base i3 at the bottom which isseated in the end of the casing i4 and is secured by suitable means such as the thumb screw I5. The movable inside cutter I6 is slotted under the shear plate, as at l1, to form cutters or teeth il that co-operate with the blades i2 to cut hair that enters the slots Ii. 'I'his form of shaving head is well-known and in commercial use for a number of years. In addition to precision in manufacture it is necessary to establish an even pressure on the inside cutter to cause the teeth and blades to t snugly together on their abutting faces. The movable inside cutter is operated by suitable means and I show a lever I9 that passes into a recess 20 in the inside cutter and thus moves the cutter. The base i3 h as an opening at 2| and casing M has an opening 22 f or tree movement of the lever. The lever is pivoted on the stud or screw 22li and the part 23 thatv ex tends beyond the pivot is oscillated by a suitable 'Ihe invention is designed to cause a .positive clipping or shaving action along the whole length of the cutting members by an equalizing device.`

This device comprises a spring 24 of suitable sti'- ness which spring can 'rock or tilt at the central part. The spring -bears at its ends on pins 2i which pins in turn press on the bottom of the inside cutter; Any-excess pressure en one end of the spring is transmitted to the other end and the two pins bear with equal pressure on the inside cutter. 'I'he pins pass loosely through the openings 26 in the casing and outer member to enable them to rock slightly as the cutter is re-4 ciprocated and the shoulders 26n may be employed preventing undue projection of the pins or their loss when the shaving head is removed from the-casing for cleaning or inspection. 'Ihe spring may be hollowed as at21 for reception of the ends of the pins 25. The spring is preferably formed it on the stud or screw 22 and still allowing freedom for the spring to rock. 'I'his overcomes the dimculty in having separate springs which dimculty is caused by the springs being o f diiierent into a spring loop 28, at its center for clamping` not as satisfactory as at the other end. In Figures 1, 2 and 3 the pins can rock slightly and preferably have rounded ends.

An alternative form is shown in Figure 4 in which the pins 29 are ixed against rocking but can slide freely in the openings 30. The form shown presents hollow pins which may be provided with-a plug or wick 3l either made of lubricant or impregnated with a lubricant.-

In Figure 5, I show the spring means' as applied to a shaving head of tubular form with the outer member 3|'L having an eccentrically arranged inner cutter 32 with an eccentric bore 33 in it.

'I'he pins will compensate for any wear on the abutting surfaces of the cutters and maintain an even pressure at all times.

I claim: i

1. A dry shaver Icomprising an outer member, an inside cutter movable in the outer member, pins bearing on the inside cutterat its ends, and a spring supported intermediate its ends and with its ends bearing on the ends of the pins whereby both ends of the inside cutter operate under the same pressure.

2. In a device of the kind described, a casing,

a shearing head secured on. the end of the casing, the shearing head comprising an outside cutter, an inside cutter movable inside the outside cutter, a spring supported at its centre inside the casing in a manner to allow a limited tilting and posts bearing on the ends of the spring and on the under side of the inside cutter.

3. In a device of the kind described, a casing, a shearing head secured on the end of the casing, 'the shearing head comprising an outside cutter, an inside cutter movable inside the outside cutter, a spring supported at its centre inside the casing in a manner to allow a limited tilting, and posts having a slight rocking motion when the inside cutter is operated.

4. In a device of the kind described, a casing, a shearing head secured on the end of the casing, the shearing head comprising an outside cutter, an inside cutter movable inside the outside cutter, a spring supported at its centre inside the casing in a manner to allow a limited tilting and posts with lubricating wicks bearing on the ends of the spring and on the under side of the inside 

